@article{MuellerBillmaierMueller2013,
  author    = {M{\"u}ller, Karsten and Billmaier, Karl and M{\"u}ller, Ernst A.},
  title     = {Abwasserw{\"a}rmenutzung},
  series = {Wasserwirtschaft, Wassertechnik : wwt. 2013, H. 5},
  journal   = {Wasserwirtschaft, Wassertechnik : wwt. 2013, H. 5},
  publisher = {Deutscher Fachverlag},
  address   = {Frankfurt am Main},
  issn      = {1438-5716},
  pages     = {24 -- 26},
  year      = {2013},
  language  = {de}
}
@article{HeggerClassenSchaumannetal.2013,
  author    = {Hegger, Josef and Claßen, Martin and Schaumann, Peter and Sothmann, J{\"o}rg and Feldmann, Markus and D{\"o}ring, Bernd},
  title     = {Entwicklung einer integrierten Verbunddecke f{\"u}r nachhaltige Stahlbauten},
  series = {Stahlbau},
  volume    = {Vol. 82},
  journal   = {Stahlbau},
  number    = {Iss. 1},
  publisher = {Wiley},
  address   = {Weinheim},
  issn      = {1437-1049 (E-Journal); 0038-9145 (Print)},
  pages     = {11 -- 17},
  year      = {2013},
  language  = {de}
}